摘要
针对潜山裂缝双重介质油藏水驱至高含水期后,实施三次采油提高采收率机理认识有待提高的问题,以海上A油田为研究对象,依据相似准则设计双重介质油藏物理模型,在该类型油藏条件下开展优化注水后,进行氮气驱、气水交替驱、凝胶颗粒驱及表面活性剂驱等实验,并进行不同提高采收率方法的驱油机理研究。结果表明:水驱后氮气驱主要依靠气液密度差异驱替油藏顶部剩余油,采收率提高0.4~2.1百分点,采收率提高幅度主要取决于生产井垂向位置;气水交替驱能够控制氮气段塞前缘的稳定性,从而削弱气窜流现象,采收率提高2.0~5.2百分点;凝胶颗粒驱可以较好地改善裂缝系统的非均质性,扩大注入水的波及范围,采收率提高1.2~3.7百分点;表面活性剂驱通过清洗宏观裂缝表面的剩余油提高采收率,后续配合焖井一段时间,可促进基质微裂缝的自发渗吸作用,进一步提高采收率,采收率提高2.5~4.3百分点。本研究首次分析了三维大尺度双重介质油藏高压物理模型三次采油开发特征,并深化了双重介质油藏三次采油提高采收率机理认识,为现场方案设计及应用提供了相应的理论指导。
Aiming at the problem that the understanding of EOR mechanism of tertiary oil recovery in dual media reservoir of buried hill fractures needs to be improved after water flooding to high water cut stage,taking offshore oilfield A as the research object,the physical model of dual medium reservoir is designed according to the similarity criteria.After optimized water injection under the conditions of this type reservoir,nitrogen flooding,water-alternating-gas flooding,gel particle flooding and surfactant flooding experiments are carried out,and the oil displacement mechanism of different EOR methods is studied.The results show that nitrogen flooding after water flooding mainly depends on gas-liquid density difference to displace the remaining oil at the top of the reservoir,improving oil recovery by 0.4-2.1 percentage point,and the extent of oil recovery improvement mainly depends on the vertical position of the production well;water-alternating-gas flooding can control the stability of nitrogen slug front,thus weakening the phenomenon of gas channeling and improving oil recovery by 2.0-5.2 percentage point;gel particle flooding can better improve the heterogeneity of fracture system and expand the sweep range of injected water,improving oil recovery by 1.2-3.7 percentage point;surfactant flooding can improve oil recovery by cleaning the remaining oil on the surface of macro fractures,and then cooperating with a period of well stewing can promote the spontaneous imbibition of matrix micro fractures,improving oil recovery by 2.5-4.3 percentage point.This study analyzes the tertiary oil recovery development characteristics of the three-dimensional large-scale high-pressure physical model of dual media reservoir for the first time,and deepens the understanding of the tertiary oil recovery EOR mechanism of dual media reservoir,that provides theoretical guidance for the field scheme design and application.
作者
王欣然
杨丽娜
王艳霞
郭秩瑛
祝晓林
WANG Xinran;YANG Lina;WANG Yanxia;GUO Zhiying;ZHU Xiaolin(Tianjin Branch of CNOOC Ltd.,Tianjin 300459,China;CNOOC EnerTech-Drilling&Production Co.,Tianjin 300452,China)
出处
《断块油气田》
CAS
CSCD
北大核心
2022年第5期704-708,共5页
Fault-Block Oil & Gas Field
基金
国家科技重大专项课题“渤海油田高效开发示范工程”(2016ZX05058-001)。
关键词
双重介质油藏
室内实验
氮气驱
水气交替驱
凝胶颗粒驱
表面活性剂驱
提高采收率
dual media reservoir
laboratory experiment
nitrogen flooding
water-alternating-gas flooding
gel particle flooding
surfactant flooding
EOR
